bg-image($url)
  background-image: url($url + "@2x.png")
  @media (-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3)
    background-image: url($url + "@3x.png")

no-wrap()
  text-overflow: ellipsis
  overflow: hidden
  white-space: nowrap

extend-click()
  position: relative
  &:before
    content: ''
    position: absolute
    top: -10px
    left: -10px
    right: -10px
    bottom: -10px

border-1px($color)
  position : relative
  &:after
    display : block
    position : absolute
    left : 0
    bottom : 0
    width : 100%
    border-bottom : 1px solid $color
    content : ' '

border-none()
  &:after
    display : none
to-rem($num)
  $num/100
